CN113023914A - Oil-water separation treatment system and treatment method for oil field chemical flooding oil displacement produced water - Google Patents
Oil-water separation treatment system and treatment method for oil field chemical flooding oil displacement produced water Download PDFInfo
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- CN113023914A CN113023914A CN201911356163.2A CN201911356163A CN113023914A CN 113023914 A CN113023914 A CN 113023914A CN 201911356163 A CN201911356163 A CN 201911356163A CN 113023914 A CN113023914 A CN 113023914A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/40—Devices for separating or removing fatty or oily substances or similar floating material
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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Abstract
The invention discloses a treatment system and a treatment method for oil-water separation of oil field chemical flooding oil displacement produced water. The treatment system disclosed by the invention is used for carrying out oil-water separation on the oilfield chemical flooding produced water, so that on one hand, the effective oil-water separation of the chemical flooding high polymer-containing oily sewage is realized, and on the other hand, the effective removal of part of oil and suspended solid pollution impurities can be realized. After the treatment system and the treatment method disclosed by the invention are used for treating the effluent, the water quality can be ensured to meet the index requirements that the oil content is less than or equal to 50mg/L and the suspended solid content is less than or equal to 50mg/L, the water quality requirements of subsequent water treatment equipment are met, and the treatment load of the subsequent water treatment equipment is reduced. In addition, the treatment system is safe and reliable, is convenient to operate, is a movable skid-mounted complete treatment system, and meets the requirements of the treatment of the produced water of the chemical flooding dispersion block of the oil field, so that the on-site separation treatment of oil and water can be quickly and efficiently realized.
Description
Technical Field
The invention relates to the technical field of water treatment, in particular to a treatment system and a treatment method for oil-water separation of oil field chemical flooding oil displacement produced water, which are used for performing oil-water separation on the oil field chemical flooding oil displacement produced water.
Background
In order to improve the yield and the recovery ratio of crude oil in the later stage of oil field development, a polymer oil displacement agent and an alkali, surfactant and polymer-containing ternary composite oil displacement agent are sequentially used for chemical oil displacement. The chemical oil displacement is specifically as follows: the oil displacement agent is injected into the underground through the injection well, and can improve the thickening capability of crude oil and reduce the interfacial tension of the crude oil, so that the oil displacement agent has the capability of washing oil and the like, and crude oil in a stratum is dissolved and carried. In the process, the oil displacement agent and the crude oil form an oil-water-gas mixed solution (namely, produced liquid), the oil-water-gas mixed solution is lifted to the ground through a production well by a pumping unit, and then the gas is separated from the oil and the water in three phases to respectively obtain the natural gas, the crude oil and the oily sewage (namely, oil field chemical flooding oil displacement produced water, which is called as produced water for short).
Most polymers in the oil displacement agent can be dissolved in produced water, so that the viscosity of the produced water is increased, and the emulsification degree is increased, which is specifically represented as follows: the oil droplet particles in the produced water become fine and the oil droplet floating speed becomes slow, so that the oil-water separation of the produced water is very difficult.
At present, the oil-water separation and filtration treatment of the produced water are mainly carried out by adopting a treatment process combining vertical gravity sequencing batch sedimentation and multi-stage low-filtration-rate filtration. However, the sedimentation treatment efficiency of the gravity sequencing batch is relatively low, and the equipment is large in size, so that the occupied area is large; and only gravity sequential batch sedimentation is adopted, the expected oil and water sedimentation separation effect is difficult to achieve, the oil content of the effluent of the sedimentation tank is greatly increased, the water quality of the influent water of subsequent filtration treatment equipment is difficult to ensure, the treatment load of the subsequent filtration equipment is increased, and finally the oil content and the suspended solid content of the effluent after filtration exceed the standard, and the oil reservoir pollution is caused by reinjection into the ground. And at present, gravity sequencing batch sedimentation must be matched with multi-stage low-filtration-rate filtration for use, and the matching of the gravity sequencing batch sedimentation and the multi-stage low-filtration-rate filtration has the defects of long sewage treatment residence time, complex treatment process and operation, large one-time engineering investment and the like.
Therefore, the research and development of a set of treatment system capable of effectively separating oil from water in the oil field chemical flooding oil displacement produced water is imperative.
Disclosure of Invention
The invention aims to overcome the technical defects in the prior art, and provides a treatment system capable of effectively separating oil from water in oil field chemical flooding oil displacement produced water in a first aspect, which comprises:
a pipeline coalescence degreaser for primarily coalescing oil drops in the produced water,
a rotary oil-water separation device for performing three-phase separation of water, oil and slag on the produced water after the primary coalescence, an
A multi-stage circulation flotation column for further separating water, oil and slag;
the pipeline coalescence degreaser is provided with a liquid outlet which is connected with a liquid inlet arranged on the rotary oil-water separation device; the rotary oil-water separation device is provided with a liquid outlet which is connected with a liquid inlet arranged on the multi-stage circulation flotation column;
the rotary oil-water separation device is provided with an oil discharge port and is connected with the sump oil tank; the rotary oil-water separation device is provided with a slag discharge port, and the multi-stage circulation flotation column is provided with an oil discharge slag discharge port which are connected with a sludge tank.
The multistage circulating flotation column is a cylindrical hollow column body, the top of the column body is provided with a liquid distributor connected with the liquid inlet, the upper part of the column body is provided with an oil outlet and a slag outlet, the lower part of the column body is provided with a water outlet, and the bottom of the column body is provided with an ejector with an upward nozzle; the column body is internally provided with a plurality of stages of flotation structures in sequence from top to bottom in the vertical direction, and each stage of flotation structure comprises a circular truncated cone-shaped baffle plate and a hollow cylindrical air inlet pipe which is open at the top and the bottom and is vertically arranged from top to bottom in the vertical direction; the axes of the baffle plate and the air inlet pipe are on the same straight line, and a gap is reserved between the baffle plate and the inner wall of the cylinder.
The multistage circulation flotation column further comprises a dosing static mixer, a flotation agent is contained in the dosing static mixer, and a chemical outlet of the dosing static mixer is connected with a liquid inlet of the multistage circulation flotation column.
The liquid inlet of the pipeline coalescence degreaser is also connected with the medicine outlet of the medicine adding device, and the medicine adding device is filled with a reverse demulsifier.
The pipeline coalescence degreaser comprises a plurality of horizontal pipes which are arranged in a row in parallel in the vertical direction, the end parts of the same sides of two adjacent horizontal pipes are connected by a bent pipe to form a pipeline which is in a snake-shaped multilayer spiral folding shape in the vertical direction, a liquid inlet is arranged at the lower part of the pipeline coalescence degreaser, and a liquid outlet is arranged at the upper part of the pipeline coalescence degreaser.
The rotary oil-water separation device comprises a barrel body, wherein a liquid inlet and a liquid outlet are arranged at the lower part of the barrel body, a slag discharge port and a vent port are arranged at the bottom of the barrel body, an oil discharge port is arranged at the upper part of the barrel body, and an exhaust hole is arranged at the top of the barrel body; the central shaft position in the staving is equipped with the pivot, and the pivot is connected with the outside speed reducer of staving and motor, is equipped with planar and with the pivot on the coplanar sieve membrane in the pivot.
The sieve plate membrane has a plurality ofly, all sets firmly in the pivot and uses the pivot as the axial symmetry, has the same contained angle between every sieve plate membrane.
And a buffer tank and a first lifting pump are further arranged between the rotary oil-water separation device and the multistage circulating flotation column, and a liquid inlet of the multistage circulating flotation column is connected with the buffer tank through the first lifting pump.
In a second aspect, the invention provides a treatment method capable of effectively separating oil and water from produced water of oil field chemical flooding displacement, the treatment system is used for discharging produced liquid to be treated into a pipeline coalescence degreaser for primary coalescence of oil drops, then all the produced liquid is discharged into a rotary oil-water separation device for three-phase separation of oil, water and slag, the oil phase and the slag phase are respectively discharged into a sump oil tank and a sump residue tank, the water phase is discharged into a multi-stage circulation flotation column for further removing oil phase and suspended solid impurities in the water phase until the oil content of the water phase is less than or equal to 50mg/L and the suspended solid content is less than or equal to 50mg/L, and the three-phase separation treatment of the oil, the water and the slag of the produced.
The method specifically comprises the following steps:
(1) the produced water to be treated enters a pipeline coalescence degreaser for primary coalescence of oil drops; preferably, a reverse demulsifier is added into the pipeline coalescence degreaser through a dosing device to improve demulsification of the produced water in the pipeline so as to enable oil drops to collide and coalesce;
(2) all produced water subjected to oil drop preliminary coalescence by a pipeline coalescence degreaser enters a rotary oil-water separation device for oil-water-slag three-phase separation, wherein a separated water phase enters a buffer tank, a separated slag phase enters a slag tank, and a separated oil phase enters a sump oil tank;
(3) the water phase in the buffer tank is boosted and lifted by a first lifting pump and enters a multi-stage circulation flotation column for further oil-water-slag three-phase separation until the water quality meets the index requirements that the oil content is less than or equal to 50mg/L and the suspended solid content is less than or equal to 50mg/L, and the treatment of the produced water is finished; wherein the separated floating oil and slag phase enter a slag tank;
preferably, a part of water phase separated by the multistage circulating flotation column is mixed with air to form air-water mixed liquid, the air-water mixed liquid enters the multistage circulating flotation column, fine bubbles are released through an air-water mixing pipe in the multistage circulating flotation column, the bubbles can float upwards after being released, the flow direction of the air-water mixed liquid is opposite to that of produced water to be treated, the bubbles are contacted with fine oil droplets and carry fine oil droplets and fine particle impurities to float to the liquid surface in the floating process, so that the fine oil droplets are coalesced to form floating oil, and the floating oil is discharged through an oil discharge and slag discharge port.
The produced water in the multi-stage circulation flotation column circularly flows in the vertical direction, and the collision probability of bubbles and oil drops in the produced water to be treated is increased, so that the oil drops and the oil drops are converged, the particle size is increased, floating oil gradually floats upwards along the water flow direction and is separated from the water, and oil-water separation is realized.
The treatment system provided by the invention uses the pipeline coalescence degreaser, the rotary oil-water separation device and the multi-stage circulation flotation column as main treatment equipment to carry out oil-water separation on the oilfield chemical flooding produced water, so that on one hand, the effective oil-water separation of the chemical flooding high polymer-containing oily sewage is realized, and on the other hand, the effective removal of part of oil and suspended solid pollution impurities can also be realized. The water flow state of the produced water in the pipeline coalescence degreaser is a layer flow state or a transition flow state, oil drops are continuously collided and coalesced under the flow state, the diameter of the oil drops is increased and the oil drops upwards float under the buoyancy action of water, and finally coalescence is carried out to form an oil layer, so that the purpose of effectively colliding, coalescing and removing the oil drops in the produced water is achieved, a foundation is laid for the next oil-water phase separation, and the improvement and the guarantee of the subsequent oil-water separation effect and the oil removal rate are facilitated. The sieve plate in the oil-water separation device is rotated to achieve the demulsification effect and effect, produced water can be demulsified into small oil droplets which are easy to coalesce into large oil droplets after contacting the sieve plate, the oil-water separation is facilitated, the oil droplets are continuously collided and coalesced in disturbed water, and the coalesced oil droplets form an oil phase which floats to the water surface.
When the oil content of the inlet water is less than or equal to 3000mg/L and the suspended solid content is less than or equal to 200mg/L, the treatment system and the treatment method can ensure that the water quality of the outlet water meets the index requirements of the oil content of less than or equal to 50mg/L and the suspended solid content of less than or equal to 50mg/L, meet the requirements of subsequent water treatment equipment on the water quality, and reduce the treatment load of the subsequent water treatment equipment. In addition, the treatment system is safe and reliable, is convenient to operate, is a movable skid-mounted complete treatment system, and meets the requirements of the treatment of the produced water of the chemical flooding dispersion block of the oil field, so that the on-site separation treatment of oil and water can be quickly and efficiently realized.
Drawings
FIG. 1 is a schematic structural diagram of a treatment system for oil-water separation of oil-field chemical flooding produced water according to the present invention;
FIG. 2 is a schematic view of the configuration of the coalesced degreaser of the present invention in the pipeline of the treatment system;
FIG. 3 is a schematic view showing the structure of a rotary oil-water separator in the treatment system of the present invention;
FIG. 4 is a schematic diagram showing the construction of a multi-stage loop flotation column in the treatment system of the present invention;
FIG. 5 is a flow chart of the oil-water separation treatment method for oil field chemical flooding produced water according to the present invention.
Detailed Description
In the later stage of oil field development, chemical oil displacement technologies such as polymer flooding, ternary combination flooding and the like are popularized and implemented in a large area to improve the crude oil recovery rate, the treatment capacity of the generated sewage is greatly increased, the conventional vertical gravity sequencing batch sedimentation and multistage low-filtration-rate filtration are difficult to separate oil from water in the sewage at present, the sedimentation separation effect is poor, the oil content and the suspended solid content in the separated effluent are high, and the water quality requirement of the inlet water of subsequent treatment equipment cannot be met. The invention mainly aims at the bottleneck problem and provides a treatment system capable of improving the oil-water separation effect of chemical-flooding produced water such as polymer flooding, ternary combination flooding and the like. The system can effectively separate oil from water of produced water, has high oil removal rate, has low oil content and suspended solid content in the treated effluent, and meets the water quality requirement of inflow water of subsequent treatment equipment, thereby reducing the treatment load of the subsequent treatment equipment, ensuring the stable water quality after final treatment, achieving the water quality control index of oilfield reinjection water, and then reinjecting underground to realize green oilfield development and improve crude oil recovery.
The present invention will be described more specifically and further illustrated with reference to specific examples, which are by no means intended to limit the scope of the present invention.
The invention effectively combines three devices of a pipeline coalescence degreaser, a rotary oil-water separation device and a multi-stage circulation flotation column, efficiently realizes the separation of oil and water in the oil-containing produced water of the high-emulsification oil-displacement agent generated by chemical oil displacement, greatly reduces the oil content and the suspended solid content in the water, and lightens the working load of subsequent treatment equipment.
The treatment system capable of effectively separating oil from water in oil-field chemical flooding oil-displacement produced water has a structure shown in figure 1, and comprises a pipeline coalescence oil remover 1, a rotary oil-water separation device 2, a buffer tank 3, a first lift pump 4 and a multi-stage circulation flotation column 5 which are sequentially connected. Wherein,
the vertical section of the pipeline coalescence degreaser 1 is as shown in figure 2, the pipeline is divided into a plurality of horizontal pipes and bent pipes, the horizontal pipes are in the same plane and are arranged in a row in parallel in the vertical direction, the bent pipes connect the end parts of the same side (left side or right side) of two adjacent horizontal pipes, and the horizontal pipes and the bent pipes jointly form a pipeline which is S-shaped (or snakelike) and is folded in a multilayer spiral mode in the vertical direction. The pipeline coalescence degreaser 1 is provided with a liquid inlet, a liquid outlet and a medicine adding port. The liquid inlet is arranged at the lower part of the pipeline coalescence degreaser 1 and is communicated with the produced water to be treated, and the produced water to be treated is led into the treatment system of the invention and enters the multilayer spiral folded pipeline coalescence degreaser 1. The liquid outlet is arranged at the upper part of the pipeline coalescence degreaser 1 and is connected with the rotary oil-water separation device 2, and the preliminarily coalesced oil and water is guided into the rotary oil-water separation device 2 for further oil-water separation treatment.
The equivalent diameter of the pipeline coalescence degreaser 1 is adjusted and designed according to the actual treatment capacity, and generally can be set to be 200 mm-500 mm, the total length of the multilayer spiral folding pipeline can be designed to be 1.5m, 2.0m, 2.5m, 3.0m and the like according to the actual requirement, and the produced water enters the pipeline coalescence degreaser 1, then repeatedly spirals at the flow speed of 0.1 m-0.3 m/s, and finally flows out of the liquid outlet of the pipeline coalescence degreaser 1. The pipe coalescence degreaser 1 is a device for coarsening oil drops through turbulence, produced water enters a Snake Pipe (SP) and then moves in a bending way along the pipe, so that enough turbulence is formed, oil drops are coarsened without shearing, and sufficient turbulence and retention time are provided for coalescence of the oil drops by using the diameter and the length of the pipe. The water flow state in the pipeline coalescence degreaser 1 is a layer flow state or a transition flow state, oil drops in the produced water are continuously collided and coalesced under the flow state, the diameter of the oil drops can be increased, the oil drops float upwards under the buoyancy action of water, and finally coalescence is carried out on the upper wall surface and the side wall surface of the pipeline to form an oil layer, so that the purpose of effectively colliding, coalescing and removing the oil drops in the produced water is achieved, the foundation is laid for the next oil-water phase separation, and the subsequent oil-water separation effect and the oil removal rate are favorably improved and ensured.
The pipeline coalescence degreaser 1 is also provided with a dosing port which is connected with a dosing device 8, and a reverse demulsifier is added into the pipeline coalescence degreaser, wherein the dosing amount of the reverse demulsifier needs to be determined on site according to the water quality condition to be treated, and the final concentration of the reverse demulsifier is usually 20-50 mg/L. The reverse demulsifier may be selected from cationic polyacrylamides.
The oil-water separation device 2 is rotated, a rotating sieve plate film is adopted for removing oil, and the produced water after coalescence collision of the coalescence degreaser 1 through the pipeline is further subjected to three-phase separation of oil, water and impurities. The oil-water separation device 2 can be rotated to effectively remove suspended solid particles, so that the oil-water separation and removal effect and efficiency of the chemical flooding produced water are further improved. The rotary oil-water separating device 2 has a structure shown in fig. 3, and comprises a barrel body 21, wherein a liquid inlet 27 is formed in the lower portion of the side wall of the barrel body 21 and used for introducing produced water treated by the pipeline coalescence degreaser 1 into the rotary oil-water separating device 2. A liquid outlet 28 is arranged at the lower part of the side wall of the barrel body 21 opposite to the liquid inlet 27, the liquid outlet 28 is connected with the buffer tank 3, and the treated water phase is led out to the buffer tank 3. The bottom of the barrel body 21 is provided with a slag discharge port 29 which is connected with the sewage tank 7 and discharges the separated suspended solid particles (namely, the sediments) into the sewage tank 7. An oil drain port 30 is provided at the upper part of the tub 21, and the separated oil phase is discharged into the sump oil tank 6. In order to ensure that the floating oil separated from the upper part of the rotary oil-water separating device 2 uniformly and intensively reaches the oil outlet 30 and is discharged from the oil outlet 30, the oil outlet 30 can be arranged at the middle lower part of the barrel body 21, an oil collecting tank 31 is arranged on the inner wall of the barrel body 21 close to the top part, and is used for collecting the separated oil phase, and the oil collecting tank 31 is connected with the oil outlet 30 through a pipeline. A small amount of gas is generated in the operation process of the rotary oil-water separation device 2, and the gas is gathered at the top of the barrel body 21. In order to discharge the gas collected at the top of the barrel body 21 and ensure the treatment effect and normal operation of the rotary oil-water separating device 2, an exhaust hole 32 is formed at the top of the barrel body 21. In order to empty all the substances in the rotary oil-water separator 2 during maintenance, a vent 33 is further formed at the bottom of the barrel body 21, and all the substances are completely discharged from the barrel body 21 before maintenance. A rotating shaft 22 is arranged at the central shaft position in the barrel body 21, the rotating shaft 22 is connected with a speed reducer 24 and a motor 25 outside the barrel body 21, and the speed reducer 24 and the motor 25 can be used for controlling the rotating speed of the rotating shaft 22. A sieve plate film 23 is fixedly arranged on the rotating shaft 22. The screen membrane 23 is a plane, coplanar with the rotation shaft 22 and axisymmetric with the rotation shaft 22. The sieve plate membranes 23 are provided with a plurality of pieces, preferably 8 pieces, and each sieve plate membrane 23 has a certain included angle. A bracket 26 is also provided at the top of the tub 21 to provide support for the motor 25.
The rotating oil-water separating device 2 is a rotating sieve plate membrane oil remover, and a plurality of vertical modified polytetrafluoroethylene membrane sieve plates (sieve plate membranes 23) welded on a rotating shaft 22 are arranged in a vertical barrel body 21. During the use, the produced water of 1 processing of pipeline coalescer gets into staving 21 by inlet 27, and motor 25 drives pivot 22 simultaneously and rotates, and pivot 22 drives sieve plate membrane 23 and rotates, and this process makes the oil globule in aqueous constantly collide and gather in the aquatic of disturbance on the one hand, and the oil globule of gathering forms the oil phase and floats to the surface of water and discharges from oil drain port 30 after oil receiving groove 31 collects, and the aqueous phase then discharges through liquid outlet 28, waits to get into the multistage flotation column water oil separating treatment facility of next stage and does further water oil separating. On the other hand, the modified polytetrafluoroethylene membrane sieve plate has the function and the effect of demulsification, and produced water is firstly demulsified into small oil droplets which are easy to be combined into large oil droplets after contacting the sieve plate, so that the oil-water separation is more facilitated. The sludge is separated from the produced water through sedimentation, is accumulated at the bottom of the barrel body 21 and is periodically discharged through a slag discharge port 29.
A liquid inlet and a liquid outlet of the buffer tank 3 are respectively connected with the rotary oil-water separation device 2 and the multi-stage circulation flotation column 5, and a first lifting pump 4 is further arranged between the buffer tank 3 and the multi-stage circulation flotation column 5 and used for guiding liquid stored in the buffer tank 3 into the multi-stage circulation flotation column 5.
The multi-stage circular flow flotation column 5 is a multi-stage flotation oil-water separation device which is established by adopting a plurality of (according to actual requirements) coaxial gas-liquid mixing pipes in a cylindrical single cylinder, and as shown in fig. 4, comprises a vertically arranged cylindrical hollow cylinder 51, a liquid distributor 57 is arranged at the top of the cylinder 51, and the liquid distributor is used as a liquid inlet of produced water to be treated to guide a water phase treated by the rotary oil-water separation device 52 into the multi-stage circular flow flotation column 5. The liquid distributor 57 is connected to the liquid outlet of the buffer tank 3 via a liquid flow meter 59 and a pump 511 in this order. A dosing static mixer 510 is also provided between the liquid flow meter 59 and the pump 511 for dosing a flotation agent (which may be selected from polyaluminium chloride, ferrous sulfate, and the like) and mixing the flotation agent with the water phase. The upper part of the cylinder 51 is provided with an oil and slag discharging port 513 which is connected with the dirty slag tank 7; the lower part is provided with a water outlet 58 which is connected with subsequent sewage treatment equipment.
A baffle plate 56, a gas-liquid mixing pipe 55, a baffle plate 56 and a gas-liquid mixing pipe 55 are sequentially arranged in the column body 51 of the multi-stage circulation flotation column 5 from top to bottom in the vertical direction, the top part starts from the baffle plate 56, and the bottom part starts from the gas-liquid mixing pipe 55; a set of baffles 56 and gas-liquid mixing tubes 55 form a first stage flotation structure, which is arranged in the column 51 from top to bottom according to actual needs, and is therefore called a "multistage" flotation column. The baffle plate 56 is in a truncated cone shape, and has a large area as a bottom surface and a small area as a top surface, wherein the top surface faces upwards, the bottom surface faces downwards, and the baffle plate is fixed on the inner wall of the column body 51. The gas-liquid mixing pipe 55 is a hollow cylinder which is open at the upper and lower parts and is vertically arranged, is coaxial with the cylinder body 51, and is fixedly arranged on the inner wall of the cylinder body 51. All the gas-liquid mixing pipes 55 are arranged in a straight line in the vertical direction, an interval is provided between each gas-liquid mixing pipe 55, and a baffle plate 56 is provided at the interval between two gas-liquid mixing pipes 55, is also positioned on the straight line where the gas-liquid mixing pipes 55 are positioned, and has a gap with the gas-liquid mixing pipes 55. The diameter of the top surface of the baffle plate 56 is the same as that of the gas-liquid mixing pipe 55, and the diameters of the baffle plate 56 and the gas-liquid mixing pipe 55 are both smaller than the inner diameter of the column 51, namely: gaps are formed between the outer surfaces of the baffle plate 56 and the gas-liquid mixing pipe 55 and the inner wall of the cylinder 51, so that water flow can pass through; and the axes of both coincide with the axis of the cylinder 51. An ejector 54 is further arranged below the gas-liquid mixing pipe 55 at the lowest part in the column body 51, the outlet of the ejector 54 is connected with the gas-liquid mixing pipe 55 at the nearest part, and is used for providing gas-water mixed liquid into the gas-liquid mixing pipe 55 at the lowest part, and the gas-water mixed liquid sprayed out of the ejector 54 only enters the gas-liquid mixing pipe 55. The inlet of eductor 54 is connected to atmospheric air and a water source that mixes with atmospheric air at the inlet of eductor 54 to form a gas-water mixture that enters eductor 54. The ejector 54 communicates with the atmosphere through an air flow meter 53, an air conditioner 52, and an air filter 512 in this order. A portion of the outlet water from outlet 58 is connected as a source of water to the inlet of eductor 54.
In each stage of the flotation structure of the multistage circulation flotation column 5, after the gas-water mixed liquid enters the gas-liquid mixing pipe 55, the bubbles naturally reduce in the pressure releasing process, and a pressure difference is formed inside and outside the gas-liquid mixing pipe 55, so that the treated produced water circularly flows in the vertical direction, the collision probability of the bubbles and oil drops in the produced water to be treated is greatly increased, oil drops and oil drops are converged, the particle size is increased, and the oil drops are separated from the water until floating oil gradually floats upwards along the water flow direction, so that oil-water separation is realized. In addition, the gas-water mixed liquid enters from the bottom of the cylinder 51 and moves from bottom to top, the produced water to be treated falls from the top of the cylinder 51 and moves from top to bottom, the gas-water mixed liquid moving from bottom to top collides with the produced water to be treated moving from top to bottom in the opposite direction, the contact area is increased, the dissolved gas in the water floats upwards, and the dissolved gas collides with small oil droplets in the falling produced water in the bubble floating upwards process and carries the small oil droplets and small particle impurities to float upwards to the liquid level, and then is discharged through an oil discharge and slag discharge port 513 on the upper part of the cylinder and is removed from the water. The gas-liquid mixing pipes 55 of the adjacent two-stage flotation structure are isolated by a circular truncated cone-shaped baffle plate 56 to prevent the liquid between two stages from mixing to influence the oil-water separation effect, thereby realizing the step-by-step air flotation.
The multi-stage circulation flotation column 5 can not only remove the dissolved oil in the produced water, but also remove the suspended solids in the produced water. The oil phase and the impurities separated by the multistage circulation flotation column 5 are discharged through an oil discharge and slag discharge port 513, and the separated water phase is discharged through a water outlet 58.
Because the oil-water separation device 2 needs to be periodically backwashed, the water outlet 58 of the multi-stage circulation flotation column 5 can be connected with the backwashing water inlet of the rotary oil-water separation device 2, the water treated by the multi-stage circulation flotation column 5 is used for backwashing and regenerating the sieve plate membrane 23, the regenerating mode can be selected from a gas-water backwashing regenerating mode, and the backwashing effluent is directly reprocessed in the rotary oil-water separation device 2 without being discharged.
By using the treatment system, the invention also provides a treatment method capable of effectively separating oil from water for the oil-field chemical flooding oil-displacement produced water, the process flow schematic diagram is shown in figure 5, and the specific process is as follows:
(1) various chemical flooding produced water to be treated enters a pipeline coalescence degreaser 1 to be subjected to primary coalescence of oil drops; in order to enhance the effect of removing dirty oil and solid particle impurities, a chemical adding device 8 is needed to add a reverse demulsifier into the pipeline coalescence degreaser 1 to improve demulsification of produced water in a pipeline, so that oil drops collide and coalesce, and the diameter of the oil drops is increased;
(2) all produced water subjected to primary oil drop coalescence by the pipeline coalescence degreaser 1 enters the rotary oil-water separation device 2 to be subjected to oil-water-slag three-phase separation, wherein a separated water phase enters the buffer tank 3, a separated slag phase enters the slag tank 7, and a separated oil phase enters the sump oil tank 6;
(3) the water phase in the buffer tank 3 is boosted by a first lifting pump 4 and lifted to enter a multi-stage circulation flotation column 5 for further oil-water-slag three-phase separation, and finally the water quality of the effluent (after being treated by a subsequent carborundum-magnetite double-layer filter material filter 12) is ensured to meet the index requirements that the oil content is less than or equal to 50mg/L and the suspended solid content is less than or equal to 50 mg/L. Wherein the separated water phase enters a designated place for retreatment, and the separated floating oil and slag phase enter a slag tank 7, so that the oil-water separation treatment of various chemical flooding produced water is completed; liquid sludge and oil stored in the sludge tank 7 and the sump oil tank 6 are respectively and periodically transported to a sludge and sump oil treatment station for retreatment; preferably, a part of the water phase separated by the multistage circulating flotation column 5 is mixed with air to form an air-water mixed solution, the air-water mixed solution enters the multistage circulating flotation column 5, fine bubbles are released through an air-water mixing pipe 55 in the multistage circulating flotation column 5, the bubbles float upwards after being released, the air-water mixed solution and the produced water to be treated have opposite flow directions, the bubbles contact with fine oil droplets in the floating process and float upwards to the liquid surface with fine oil droplets and fine particle impurities, so that the fine oil droplets are coalesced to form floating oil, and the floating oil is discharged through an oil discharge and slag discharge port 513.
In order to fully utilize water resources, a part of water phase treated by the multistage circulation flotation column 5 can be boosted and lifted by the second lifting pump 9 to be used as backflow water, and the backflow water reversely enters the rotary oil-water separation device 2 for regeneration backwashing, so that the sieve plate membrane 23 recovers the original demulsification capacity to normally work in the next treatment period. In the process of regenerating and backwashing the sieve plate membrane 23, air needs to be mixed into the return water to form air-water backwashing water, so that the regeneration effect of the sieve plate membrane 23 is improved; the discharged water after back flushing the sieve plate membrane 23 can be subjected to oil, water and slag three-phase separation in the rotary oil-water separation device 2, and the separated oil, water and slag three-phase respectively enters the sump oil tank 6, the buffer tank 3 and the sump residue tank 7.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the content of the present invention.
Claims (10)
1. The utility model provides an oil field chemical flooding displacement of reservoir oil produced water oil-water separation's processing system which characterized in that includes:
a pipeline coalescence degreaser for primarily coalescing oil drops in the produced water,
a rotary oil-water separation device for performing three-phase separation of water, oil and slag on the produced water after the primary coalescence, an
A multi-stage circulation flotation column for further separating water, oil and slag;
the pipeline coalescence degreaser is provided with a liquid outlet which is connected with a liquid inlet arranged on the rotary oil-water separation device; the rotary oil-water separation device is provided with a liquid outlet which is connected with a liquid inlet arranged on the multi-stage circulation flotation column;
the rotary oil-water separation device is provided with an oil discharge port and is connected with the sump oil tank; the rotary oil-water separation device is provided with a slag discharge port, and the multi-stage circulation flotation column is provided with an oil discharge slag discharge port which are connected with a sludge tank.
2. The treatment system of claim 1, wherein the multi-stage circulating flotation column is a cylindrical hollow column, a liquid distributor connected with the liquid inlet is arranged at the top of the column, an oil outlet and a slag outlet are arranged at the upper part of the column, a water outlet is arranged at the lower part of the column, and an ejector with an upward nozzle is arranged at the bottom of the column; the column body is internally provided with a plurality of stages of flotation structures in sequence from top to bottom in the vertical direction, and each stage of flotation structure comprises a circular truncated cone-shaped baffle plate and a hollow cylindrical air inlet pipe which is open at the top and the bottom and is vertically arranged from top to bottom in the vertical direction; the axes of the baffle plate and the air inlet pipe are on the same straight line, and a gap is reserved between the baffle plate and the inner wall of the cylinder.
3. The treatment system according to claim 2, wherein the multistage loop flotation column further comprises a dosing static mixer, wherein a flotation agent is contained in the dosing static mixer, and a chemical outlet of the dosing static mixer is connected with a liquid inlet of the multistage loop flotation column.
4. The treatment system of any one of claims 1 to 3, wherein the liquid inlet of the pipeline coalescence degreaser is further connected with a medicine outlet of a medicine adding device, and the medicine adding device contains a reverse demulsifier.
5. The treatment system according to any one of claims 1 to 4, wherein the tube coalescence degreaser comprises a plurality of horizontal tubes arranged in a row in parallel in the vertical direction, the end parts of the same sides of two adjacent horizontal tubes are connected by a bent tube to form a tube folded in a serpentine multi-layer spiral manner in the vertical direction, a liquid inlet is arranged at the lower part of the tube coalescence degreaser, and a liquid outlet is arranged at the upper part of the tube coalescence degreaser.
6. The treatment system according to any one of claims 1 to 5, wherein the rotary oil-water separation device comprises a barrel body, a liquid inlet and a liquid outlet are arranged at the lower part of the barrel body, a slag discharge port and a vent port are arranged at the bottom of the barrel body, an oil discharge port is arranged at the upper part of the barrel body, and an exhaust hole is arranged at the top of the barrel body; the central shaft position in the staving is equipped with the pivot, and the pivot is connected with the outside speed reducer of staving and motor, is equipped with planar and with the pivot on the coplanar sieve membrane in the pivot.
7. The treatment system according to claim 6, wherein the plurality of screen membranes are fixed on the rotating shaft and are axisymmetric about the rotating shaft, and each screen membrane has the same included angle therebetween.
8. The treatment system according to any one of claims 1 to 7, wherein a buffer tank and a first lift pump are further arranged between the rotary oil-water separation device and the multi-stage circulation flotation column, and a liquid inlet of the multi-stage circulation flotation column is connected with the buffer tank through the first lift pump.
9. A treatment method for oil-water separation of produced water in oil field chemical flooding oil displacement is characterized in that the treatment system of any one of claims 1 to 8 is used, produced liquid to be treated is discharged into a pipeline coalescence degreaser to carry out primary coalescence of oil drops, then the produced liquid is completely discharged into a rotary oil-water separation device to carry out oil-water-residue three-phase separation, an oil phase and a residue phase are respectively discharged into a sump oil tank and a sump residue tank, a water phase is discharged into a multi-stage circulation flotation column to further remove oil phase and suspended solid impurities in the water phase until the oil content of the water phase is less than or equal to 50mg/L and the suspended solid content is less than or equal to 50mg/L, and the oil-water-residue three-phase separation treatment of.
10. The processing method according to claim 9, characterized in that it comprises in particular the steps of:
(1) the produced water to be treated enters a pipeline coalescence degreaser for primary coalescence of oil drops; preferably, a reverse demulsifier is added into the pipeline coalescence degreaser through a dosing device to improve demulsification of the produced water in the pipeline so as to enable oil drops to collide and coalesce;
(2) all produced water subjected to oil drop preliminary coalescence by a pipeline coalescence degreaser enters a rotary oil-water separation device for oil-water-slag three-phase separation, wherein a separated water phase enters a buffer tank, a separated slag phase enters a slag tank, and a separated oil phase enters a sump oil tank;
(3) the water phase in the buffer tank is boosted and lifted by a first lifting pump and enters a multi-stage circulation flotation column for further oil-water-slag three-phase separation until the water quality meets the index requirements that the oil content is less than or equal to 50mg/L and the suspended solid content is less than or equal to 50mg/L, and the treatment of the produced water is finished; wherein the separated floating oil and slag phase enter a slag tank;
preferably, a part of water phase separated by the multistage circulating flotation column is mixed with air to form air-water mixed liquid, the air-water mixed liquid enters the multistage circulating flotation column, fine bubbles are released through an air-water mixing pipe in the multistage circulating flotation column, the bubbles can float upwards after being released, the flow direction of the air-water mixed liquid is opposite to that of produced water to be treated, the bubbles are contacted with fine oil droplets and carry fine oil droplets and fine particle impurities to float to the liquid surface in the floating process, so that the fine oil droplets are coalesced to form floating oil, and the floating oil is discharged through an oil discharge and slag discharge port.
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